26However, it is settled case-law that actions between a public authority and a person governed by private law fall outside the scope of the Brussels Convention only in so far as that authority is acting in the exercise of public powers (see, to that effect, Case 29/76 LTU v Eurocontrol [1976] ECR 1541, paragraph 4; Case 814/79 Ruffer [1980] ECR 3807, paragraph 8, and Case C-172/91 Sonntag [1993] ECR I-1963, paragraph 20).
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